Kbase 21340: How Progress resolves device name in the _Connect VST?
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
15/10/2008 |
|
Status: Unverified
GOAL:
How Progress resolves device name in the _Connect VST?
GOAL:
_Connect Virtual System Table device resolution
FIX:
The _connect-device name is populated by a string passed from the Client machine to the Server in the "login message". The Client uses the "gethostname()" function to retrieve a string with the host's name. Based on the Windows socket provider, this will either return the host name alone or a fully qualified name (for example, host.sub-domain.top-domain).
This segment from the MSDN documentation on the "gethostname()" offers further insights:
"The gethostname function returns the name of the local host into the buffer specified by the name parameter. The host name is returned as a null-terminated string. The form of the host name is dependent on the Windows Sockets provider -- it can be a simple host name, or it can be a fully qualified domain name."
NOTE: What is returned from the socket provider for the host name may vary. A problem arises where there are two disparate lengths to deal with inside the database client -- a maximum host name length of 32 bytes and the login device name with its maximum length of 60 bytes. If for any reason the 32-byte maximum host name is exceeded, Progress will send a null string.